Board Thread:DMC5 Spoilers/@comment-39313039-20190501062641/@comment-6769189-20190501092459

Vergil didnt forget her. After finding out Nero was his son he basically had laser guided memory of her. Vergil hadnt considered the possibility of Nero being his son. V constantly calls him "that child", even when talking to Dante about him, so i dont think he believed Nero to be directly related to Dante or himself. Since Sparda was the Lord of Fortuna in feudal times, it wouldnt be much of a stretch to believe that a descendent of Sparda was there.

Maybe Vergil used a condom and was part of that unlucky 2% failure rate. Vergil doesnt seem like one to be so reckless as to not take precautions.

As for Vergil caring about Nero's mama, i dont think he did. If he did, it was very little. She could have very easily been a fling. Maybe she had a few characteristics that Vergil found attractive but he never formed a real emotional bond. He wasn't in Fortuna very long so its unlikely that he was in love with her. I wouldnt be surprised if she persued him and he just rolled with it. He was also willing to leave open the biggest Hellgate for all of demonkind to walk through, then he willingly trapped himself in Hell.